Photo: StuartMiles - Freerange StockSt. Catharines Weather Forecast
For Thursday May 19
- Tonight – Cloudy. A few showers beginning early this evening. Low 9.
- Thursday – A few showers ending near noon then a mix of sun and cloud. Risk of a thunderstorm in the morning. Wind becoming southwest 20 km/h near noon. High 22. Humidex 25. UV index 6 or high.
- Thursday Night – Partly cloudy. Low 14 with temperature rising to 19 by morning.
